Already tried adding the Kubuntu PPA (Which tipically worked for past ktorrent versions (I always use Ktorrent because of several advantages) and it still appears like 4.0.5 in the repositories. What can i do to install the latest version?

Why would you break something that isn't broken (yet)? The current version is stable and works well. An awful answer would be: compile it yourself. But that requires a lot development files.
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LekensteynMay 27 '11 at 14:08

Actually 4.0.5 does not work well. I have had about 5 crashes over the past 3 days. Already send the crashlog to the kde devs. THIS is the main reason why i want to update. Also as i mention in the Question i tested that PPA and breaks stuff and BECAUSE of that i learned not use it and posted here for anybody else that wanted to use it to beware.
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Luis Alvarado♦May 27 '11 at 15:42

You can compile it yourself, described here:faq.Alternatively why not to install Kubuntu as a session and install it through a ppa which is more better and safer form both version stable and unstable?
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BinarylifeMay 27 '11 at 19:28

Installing Kubuntu will also give the 4.0.5 version of Ktorrent.
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Luis Alvarado♦May 27 '11 at 22:47